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Method for preparing methylamine-free perovskite thin film through low-pressure gas quenching

A technology of methylamine-free perovskite and low-pressure gas, which is applied in the field of solar cells to achieve the effect of dense film and no holes, excellent parameters, and improved stability

Active Publication Date: 2021-11-30
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned problems in the preparation of perovskite solar cells by the existing gas quenching method, and provide a method for preparing methylamine-free perovskite thin films based on ligand engineering low-pressure gas quenching and the corresponding perovskite solar cells Preparation

Method used

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  • Method for preparing methylamine-free perovskite thin film through low-pressure gas quenching
  • Method for preparing methylamine-free perovskite thin film through low-pressure gas quenching
  • Method for preparing methylamine-free perovskite thin film through low-pressure gas quenching

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Embodiment 1

[0033] A highly efficient Cs 0.1 FA 0.9 PB 3 The preparation process of perovskite solar cells, using ITO as the conductive substrate, SnO 2 The solution is the electron transport layer, Cs 0.1 FA 0.9 wxya 3 is the light absorbing layer, Spiro-OMeTAD is the hole transport layer, and silver is the back electrode, which specifically includes the following steps:

[0034] Step 1: Put the 2cm×1.6cm ITO glass into the cleaning rack, clean the surface with glass cleaner, ultrapure water and absolute ethanol in sequence, and dry it with nitrogen gas for later use;

[0035] Step 2: Incorporate the SnO 2 Colloid solution was diluted with deionized water (SnO 2 The volume ratio of colloidal solution to deionized water is 1:3,), and an appropriate amount of SnO 2 Solution, ultrasonic 20min, make it mix evenly, obtain electron transport layer solution;

[0036] Step 3: Treat the ITO glass cleaned in step 1 with ultraviolet ozone for 15 minutes, spin-coat the electron transport la...

Embodiment 2

[0042] A highly efficient Cs 0.1 FA 0.9 Pb(I 0.9 Cl 0.1 ) 3 The preparation process of perovskite solar cells, using FTO as the conductive substrate, TiO 2 is the electron transport layer, Cs 0.17 FA 0.83 PB 3 is the light absorbing layer, Spiro-OMeTAD is the hole transport layer, and gold is the counter electrode, which specifically includes the following steps:

[0043] Step 1: Put the 2cm×1.6cm FTO glass into the cleaning rack, clean the surface with glass cleaner, ultrapure water and absolute ethanol in sequence, and dry it with nitrogen gas for later use;

[0044] Step 2: Add TiO 2 Colloidal solutions were dissolved in ethanol to prepare dense TiO 2 and mesoporous TiO 2 Electron transport layer solution. Specifically, bis(acetylacetonate)diisopropyl titanate and ethanol are diluted and miscible at a volume ratio of 1:10 to obtain dense TiO 2 ; Titanium dioxide slurry (30NR-T) and ethanol are diluted and miscible according to the volume ratio of 1:6 to obtain m...

Embodiment 3

[0051] A highly efficient FAPbI 3 Preparation method of perovskite solar cell, using ITO as conductive substrate, SnO 2 The solution is the electron transport layer, FAPbI 3 The light-absorbing layer and the carbon material as the back electrode specifically include the following steps:

[0052] Step 1: Put the 2cm×1.6cm ITO glass into the cleaning rack, clean the surface with glass cleaner, acetone, isopropanol and absolute ethanol in sequence, and dry it with nitrogen gas for later use;

[0053] Step 2: Incorporate the SnO 2 Colloidal solution was diluted with deionized water for dilution (SnO 2 The volume ratio of colloidal solution to deionized water is 1:3), and an appropriate amount of SnO 2 Solution, ultrasonic 20min, make it mix evenly, obtain electron transport layer solution;

[0054] Step 3: Treat the ITO glass cleaned in step 1 with ultraviolet ozone for 15 minutes, spin-coat the electron transport layer solution on the surface, and anneal at 150° C. for 30 mi...

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Abstract

The invention discloses a method for preparing a high-quality methylamine-free perovskite thin film by low-pressure gas quenching. The method mainly comprises the following steps of: dropwise adding a precursor solution with a specific ligand on the surface of an electron transport layer or a hole transport layer, during the coating process of the precursor solution, carrying out gas quenching treatment, namely applying low-pressure gas flow to a wet film so as to promote the volatilization of a solvent and the removal of the residual ligand, and carrying out annealing treatment to enable the ligand to be completely removed, so as to obtain the high-quality perovskite thin film; preparing a hole transport layer or an electron transport layer on the perovskite thin film; and preparing an efficient perovskite solar cell device by evaporating a back electrode or laminating a carbon electrode. The stable transition-state thin film is formed through ligand coordination, the requirement for gas flow during gas quenching treatment is greatly reduced, the requirement for uniform film forming can be met through low gas flow or ultralow gas flow, the high-quality and large-grain methylamine-free perovskite thin film is prepared, and the stability of the perovskite solar cell is improved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for preparing high-quality methylamine-free perovskite thin films based on ligand engineering low-pressure gas quenching. Background technique [0002] Since the report, organic-inorganic metal halide perovskite solar cells have developed rapidly due to their advantages of low production cost, simple preparation method, and high photoelectric conversion efficiency. In just a few years, a certified power conversion efficiency of 25.5% has been achieved. (PCE). [0003] However, current high-efficiency perovskite solar cells usually contain methylamine (MA) cations, which are thermally unstable and humidity unstable, which will accelerate the degradation of perovskite films under actual working conditions, and have a negative impact on the stability of the device. Long-term stability is adversely affected. At the same time, the anti-solvent method to prepare high-eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/00H01L51/42H01L51/48H10K99/00
CPCH10K71/12H10K30/15H10K30/151H10K30/00Y02E10/549
Inventor 孙晓然侯天张萌杨鑫余雯婧蒲静怡黄跃龙
Owner SOUTHWEST PETROLEUM UNIV